Adaptive LED Flash Algorithm for Battery Voltage Stability
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Solution Overview
Problem
Portable electronic devices with integrated LED flashlights face system failures due to battery voltage drops during high peak current usage, especially in older batteries or those at lower temperatures, leading to unreliable flash operations.
Innovation Solution
An adaptive algorithm that senses the supply voltage level and determines a threshold voltage level to control the output current through the LED, preventing the voltage from dropping below this threshold during the high current phase, thereby maintaining stable power supply and preventing system failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high peak current is supplied to LED for flash operation, then illumination intensity is improved, but battery voltage drops causing system failures
Solution Approach 1:
The patent implements dynamic current control where the LED drive current is continuously adjusted based on real-time battery voltage monitoring. The system transitions from static peak current to dynamic current modulation, reducing current when voltage drops are detected and maintaining current when voltage is stable, thereby preventing system failures while preserving flash illumination capability
Solution Approach 2:
The patent employs a feedback mechanism where the battery voltage is continuously monitored during LED operation, and the measured voltage information is fed back to the control circuit to adjust the LED drive current accordingly. This closed-loop control ensures that the system responds to voltage changes in real-time, preventing voltage collapse and system failures
2Duration of action of moving object
If high peak current is supplied to LED, then flash duration is improved, but battery voltage stability deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by detecting the tendency of voltage to drop before actual system failure occurs. The control circuit monitors voltage trends during LED operation and preemptively reduces drive current when voltage stability begins to deteriorate, preventing the harmful voltage collapse before it can affect flash duration or cause system failure
3Stability of the object's composition
If adaptive voltage monitoring is implemented, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the system to monitor and regulate its own power supply conditions without external intervention. The control circuit automatically detects voltage changes and adjusts LED current accordingly, making the system self-regulating and reducing the need for complex external power management circuitry
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The algorithm ensures that the battery voltage remains above a critical level during the flash operation, preventing system failures and maintaining the light output, even in older batteries or colder conditions, by dynamically adjusting the current to match the power supply state.
Implementation Method 1
a voltage divider network (204) dividing the supply voltage into a version of the supply voltage signal
Implementation Method 2
a light-emitting semiconductor (202)
Data Source
AI summary
A method for driving a light-emitting semiconductor is provided. A supply voltage is converted into a secondary output voltage for supplying the light-emitting semiconductor with an output voltage. A level for the supply voltage at the beginning of a high current phase of the light-emitting semiconductor is sensed. A threshold voltage level for the supply voltage level is determined based on the sensed level. The high current phase with the light-emitting semiconductor is stated. The sensed level is continuously compared with the threshold voltage level, and an output current through the light-emitting semiconductor is controlled such that the sensed level does not drop below the threshold voltage level.